To be a true geek, you should be totally oblivious to the idea that what you're wearing would make any difference to anyone other than the guy at guarding the door of your favorite restaurant (and they should be tricked into finding you a table anyway. I remember one con where we tried to get seated at the "good" hotel restaurant. "You must have a reservation", they said. Even though the place was empty. So we went around a corner to the house phone, made a reservation for T+5minutes, came back then and were seated without further problems. OFFICIAL dress codes are a different thing; some places are worth getting dressed up to eat at...)
So like, usually, shorts or jeans and a really obscure and cool T-shirt.

It's clothing. wear practical garments. Not whatever is popular because it's popular.
i wear carhearts, most of the time. Pants that I can get showered in sparks, or walk through brambles, and not notice.

dude metal is the way to go mostly. never wear bright colors unless its an awesme black tee shirt with minor details. always wear dull and dark colors, and guys wear baggy clothes. you should look like ghetto. maybe sortof matrix you git the idea. trust me im a gang boss
THE PARIAH